/Engine/Source/Runtime/SlateCore/Public/Widgets/SWidget.h
Set the tool tip that should appear when this widget is hovered.
void SetToolTip ( const [TAttribute](API\Runtime\Core\Misc\TAttribute)< [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IToolTip](API\Runtime\SlateCore\Widgets\IToolTip) >> & InToolTip )